Day 11 - Task 1
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f3dec28731
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4 changed files with 206 additions and 0 deletions
97
2020/11/data.txt
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2020/11/data.txt
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89
2020/11/main.py
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89
2020/11/main.py
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import copy
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from pprint import pprint
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class PuzzleSolver:
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def __init__(self, filename):
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self.load(filename)
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def load(self, filename):
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with open(filename, "r", encoding="utf-8") as f:
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self.data = [list(x.rstrip()) for x in f.readlines()]
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self.width = len(self.data[0])
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self.height = len(self.data)
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def is_adjacent(self, x1, y1, x2, y2):
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dy = abs(y2 - y1)
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dx = abs(x2 - x1)
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return dy <= 1 and dx <= 1
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def occupied_adjacent(self, x, y):
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n = 0
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for j in range(y-1, y+2):
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for i in range(x-1, x+2):
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if (i, j) == (x, y):
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continue
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if not (0 <= i < self.width):
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continue
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if not (0 <= j < self.height):
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continue
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s = self.get(i, j)
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if s == "#":
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n += 1
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return n
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def get(self, x, y):
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return self.data[y][x]
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def mutate(self):
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ret = copy.deepcopy(self.data)
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for y in range(self.height):
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for x in range(self.width):
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s = self.get(x, y)
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if s == ".":
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continue
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n = self.occupied_adjacent(x, y)
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if s == "L":
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if n == 0:
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ret[y][x] = "#"
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elif s == "#":
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if n >= 4:
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ret[y][x] = "L"
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return ret
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def print(self):
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for y in range(self.height):
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print("".join(self.data[y]))
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print()
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def solve(self):
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stable = False
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rounds = 0
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self.print()
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while not stable:
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x = self.mutate()
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stable = x == self.data
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self.data = x
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rounds += 1
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self.print()
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return rounds
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def count_occupied(self):
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return sum([x.count("#") for x in self.data])
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ps = PuzzleSolver("test.txt")
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rounds = ps.solve()
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cs = PuzzleSolver("test-1.txt")
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assert ps.data == cs.data
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ps = PuzzleSolver("data.txt")
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rounds = ps.solve()
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n = ps.count_occupied()
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print(f"There are {n} occupied seats.")
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10
2020/11/test-1.txt
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10
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#.#L.L#.##
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#LLL#LL.L#
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L.#.L..#..
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#L##.##.L#
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#.#L.LL.LL
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#.#L#L#.##
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..L.L.....
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#L#L##L#L#
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#.LLLLLL.L
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#.#L#L#.##
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10
2020/11/test.txt
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10
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L.LL.LL.LL
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LLLLLLL.LL
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L.L.L..L..
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LLLL.LL.LL
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L.LL.LL.LL
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L.LLLLL.LL
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..L.L.....
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LLLLLLLLLL
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L.LLLLLL.L
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L.LLLLL.LL
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